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\usepackage{amssymb,amsmath,amscd,concmath}
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\begin{document}
\begin{equation*}P_\tilde{a}:=LB\!<\!P\!<\!UB=P_0\!<\!P\!<\!P_\acute{n}.\,\!\end{equation*}
\end{document}
